Tag Archives: unix

Test Jumbo Frames / MTU 9000


ping -M do -s 8972 xxx.xxx.xxx.xxx


ping -D -s 8184 xxx.xxx.xxx.xxx


ping -f -l 9000 xxx.xxx.xxx.xxx

Example results on Linux

If you’ve forgotten to enable jumbo frames/9k MTU on your client device you’re sending the ping from:

PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes
ping: sendto: Message too long

If you have enabled jumbo frames on your client but not the destination (or a switch in between):

PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes
Request timeout for icmp_seq 0

If you’ve done everything righ:

PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx): 8184 data bytes
8192 bytes from xxx.xxx.xxx.xxx: icmp_seq=0 ttl=128 time=0.714 ms

WebDAV with cURL

Assuming the following Data:

  • Webdav URL: http://example.com/webdav
  • Username: user
  • Password: pass


Reading Files/Folders

curl 'http://example.com/webdav'

Creating new Folder

curl -X MKCOL 'http://example.com/webdav/new_folder'

Uploading File

curl -T '/path/to/local/file.txt' 'http://example.com/webdav/test/new_name.txt'

Renaming File

curl -X MOVE --header 'Destination:http://example.org/webdav/new.txt' 'http://example.com/webdav/old.txt'

Deleting Files/Folders


curl -X DELETE 'http://example.com/webdav/test.txt'


curl -X DELETE 'http://example.com/webdav/test'

List Files in a Folder

curl -i -X PROPFIND http://example.com/webdav/ --upload-file - -H "Depth: 1" <<end
<?xml version="1.0"?>
<a:propfind xmlns:a="DAV:">

Continue reading WebDAV with cURL

Mount disk image partition

View partition table of disk.img:

fdisk -lu disk.img
Disk disk.img: 1.3 GiB, 1361051648 bytes, 2658304 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6f92008e

Device    Boot  Start     End Sectors  Size Id Type
disk.img1        8192  131071  122880   60M  c W95 FAT32 (LBA)
disk.img2      131072 2658303 2527232  1.2G 83 Linux

Mount partition by using start multiplied by sector size as offset

mount -o loop,offset=$((131072 * 512))